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*代码如下
*其中的参数1080根据自己的实际情况进行修改，这里的1080代表设计页面的原始宽度，可以参考psd的标准宽度，这是后字体使用rem也有了标准，psd上的字号如：40点 对应css中的rem的换算方式为40/100=0.4rem。
*/
    (function (doc, win) {
      var docEl = doc.documentElement,
        resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
        recalc = function () {
          var clientWidth = docEl.clientWidth;
          if (!clientWidth) return;
          docEl.style.fontSize = Math.floor(20 * (clientWidth / 375)) + 'px';
        };
      if (!doc.addEventListener) return;
      win.addEventListener(resizeEvt, recalc, false);
      doc.addEventListener('DOMContentLoaded', recalc, false);
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